Looks like the squashed centipede variety to me. I'm not sure about whether this occurred at the Mint. Some of the legend appears to be struck into this 'blob' which would kind of suggest it was, but............ Some people will do anything to try and create a market and generate some money from the unsuspecting. For me, if a Mint 'error' then I'd maybe pay a fiver for it, but not 200 times that. squashed centipede variety